CalculationOperatorOptions.php

<?php

namespace Drupal\rules\TypedData\Options;

use Drupal\Core\Session\AccountInterface;

/**
 * Options provider to return a choice of numeric calculation operators.
 */
class CalculationOperatorOptions extends OptionsProviderBase {
    
    /**
     * {@inheritdoc}
     */
    public function getPossibleOptions(AccountInterface $account = NULL) {
        return [
            '+' => $this->t('+ (plus)'),
            '-' => $this->t('- (minus)'),
            '*' => $this->t('* (multiply)'),
            '/' => $this->t('/ (divide)'),
            'min' => $this->t('minimum of the two values'),
            'max' => $this->t('maximum of the two values'),
        ];
    }

}